| 摘要 |
PROBLEM TO BE SOLVED: To suppress stop of power feeding to a load caused by an erroneous operation in switching procedure in an output board and an erroneous operation due to deficiency in regular UPS device stopping procedure.SOLUTION: An uninterruptible power-supply system according to an embodiment comprises: a first UPS device including a first UPS section capable of converting electric power supplied from a commercial power supply and supplying the converted electric power, and an output board to which a load is electrically connected and which supplies the electric power supplied from the first UPS section to the load; and a second UPS device including a second UPS section capable of supplying electric power in a simultaneous and parallel manner via a first power supply path capable of supplying the electric power to the load via the first UPS section and the output board by converting the electric power supplied from the commercial power supply, and a second power supply path capable of supplying the electric power to the load via the output board without via the first UPS section. Interruption of power supply from the first UPS device is prohibited until the second UPS device supplies the electric power via the first power supply path and the second power supply path in a simultaneous and parallel manner. |
